Thread: evaluating a parabola in equation form.

I don't really understand how to do this question:

If parabola goes through the point (2,0), what is the value of a?

I have been able to determine that its vertex is (3,2) meaning that 'a' must be negative.
However, I have no idea about how to derive a number....

Thank you for your help!

Can't you simply sub in (2,0) for (x,y)?

So I was overthinking it?
I see, so 'a' is -2?

Yes, and it fits in with your working that it must be negative.

You were told that the equation passes through that point so that point must be a solution for the equations. I thought it would be more complicated at first

Originally Posted by e^(i*pi)

Yes, and it fits in with your working that it must be negative.

You were told that the equation passes through that point so that point must be a solution for the equations. I thought it would be more complicated at first

Ah, I feel quite dim....
But I have learnt something, so its not so bad!

Thank you very much for your help!